Triangles Covering Triangles

The following pictures show n unit equilateral triangles covering the largest known equilateral triangles (of side length s).


1.            3.            4.
s = 1
Trivial.
s = 3/2 = 1.5
Trivial.
s = 2
Trivial.


6.            7.            8.
s =7/3 = 2.333+
Found by David Cantrell in August 2002.
s = 5/2 = 2.5
Found by Erich Friedman in 1999.
s = 8/3 = 2.666+
Found by David Cantrell in August 2002.


9.            11.            12.
s = 3
Trivial.
s = 13/4 = 3.25
Found by Erich Friedman in 1999.
s = 10/3 = 3.333+
Found by Erich Friedman in 1999.


13.            14.            15.
s = 7/2 = 3.5
Found by Erich Friedman in 1999.
s = 11/3 = 3.666+
Found by David Cantrell in August 2002.
s = 15/4 = 3.75
Found by Erich Friedman in 1999.


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